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Validity And Reliability Of The Omron HJ-303 GoSmart Tri-Axis Accelerometer-Based Pedometer

2010; Lippincott Williams & Wilkins; Volume: 45; Issue: 5 Linguagem: Inglês

10.1249/01.mss.0000385076.63045.06

1530-0315

Jeremy A. Steeves, Brian Tyo, Christopher N. Connolly, Doug Gregory, Nyle A. Stark, David R. Bassett,

Sports Performance and Training

Pedometers have the ability to provide valid, objective measures of overall ambulatory activity. PURPOSE: This three-part study compared the accuracy of a new Omron HJ-303 piezoelectric pedometer (pocket, waist-mounted and in a backpack) and two other pedometers (Sportline Traq (pocket) and Yamax SW200 (waist-mounted) under a variety of conditions. METHODS: In part I, the effects of walking speed on pedometer accuracy were examined. 60 subjects walked on a treadmill at 2, 3 and 4 mph. 20 normal weight subjects also ran at 6, 7 and 8 mph. In part II, pedometer accuracy was evaluated during other activities. 60 subjects performed front-back-side-side (FBSS) stepping, elliptical machine exercise, stationary cycling, and stair climbing/descending. 20 different participants performed ballroom dancing. In part III, device reliability was tested by having the same 60 participants complete five 100-step walks while wearing five different sets of devices: Omron HJ-303 (waist, pocket, backpack), Sportline and Yamax. An investigator determined the actual number of steps using a hand tally counter. RESULTS: Significant differences existed among pedometers (P < 0.05). For walking (2, 3 and 4 mph), the Omron pedometers (in all locations) were the most accurate. The Sportline overestimated steps at all walking speeds, while the Yamax underestimated steps at 2 mph (P<0.05). Worn on the waist, the Omron device was accurate at 6, 7 and 8 mph. In the backpack it was accurate at 6 and 7 mph, but in the pocket it was inaccurate for all running speeds. The Sportline was accurate for all running speeds. In part II, the Omron was accurate for three activities (elliptical machine and ascending/ descending stairs). The Sportline was not accurate for any activities, and Yamax was only accurate for descending stairs. None of the devices accurately recorded FBSS stepping, cycling or ballroom dance. In part III, the Omron and Yamax devices were both accurate and reliable. The Sportline, although reliable, was not accurate and consistently overestimated steps. CONCLUSIONS: The waist-mounted Omron HJ-303 pedometer, appears to be the most valid and reliable of the 3 pedometers for walking and running. The Omron is accurate for elliptical machine exercise and stair climbing/descending, but it underestimates cycling, FBSS stepping, and ballroom dance.